code: def test_accept_zoom_center(self):
      viewport = maps.InitialViewport.from_zoom_center(3, (20.0, -5.0))
      a = self.A(initial_viewport=viewport)
      assert a.initial_viewport.zoom_level == 3
      assert a.initial_viewport.center == (20.0, -5.0)
  
file_path: gmaps/gmaps/tests/test_maps.py
imports: import unittest
  import traitlets
  from ..None import maps, heatmap_layer
label_desc: Use image node_id 3 for calling the InitialViewport obj's underlying member method code with example usage: obj.test_accept_zoom_center() without return types